Making silicon molds for plaster molds (for slip casting)

I want to make a silicon mold to create plaster molds that I can use for slip casting. I was wondering if anyone had experience with the method and had some questions: 1. I will create a plastic (3D printed) mold for the silicon mold. Can I just pour it in or do I need a mold release for the silicon/plastic? 2. What kind of Shore do people recommend? Is Shore 40 okay for this application? 3. Do I need mold release for pouring in the plaster in the silicon mold? I saw some video w

This might be helpful to you as well: https://www.youtube.com/watch?v=mtvMW9qeaJ4 https://www.youtube.com/watch?v=8zWouEISprE https://www.youtube.com/watch?v=X2JS8uCPVWw This fella has a long list of YouTube videos that are pretty handy, especially the ones about mold making silicone production molds. There are more of them than these three if you go looking. I agree with Jeff that unless you need the production molds to be super high quality and very long lasting, there